A1990 820-010-41-A no power

hgoncalves

Active member
On each of those 3 ports (rebooting ones), the voltages oscilates between 0.3V and 0.9V, and one time it reached (very, very quickly 2V and then continuated to oscilate from 0.3V to 0.9V
 

hgoncalves

Active member
U3100:
PP1V1_UPC_XA_LDO_BMC = 0.535V
PP1V8_UPC_XA_LDOD = 0.496V
PP1V8_UPC_XA_LDOA = 0.538V
PP3V3_UPC_XA_LDO = 0.520V

U3200:
PP1V1_UPC_XB_LDO_BMC = 0.540V
PP1V8_UPC_XB_LDOD = 0.504V
PP1V8_UPC_XB_LDOA = 0.544V
PP3V3_UPC_XB_LDO = 0.521V

UB300:
PP1V1_UPC_TA_LDO_BMC = 0.529V
PP1V8_UPC_TA_LDOD = 0.0671V

I think that the short is here. Shall I remove UB300?
 

hgoncalves

Active member
Sorry for the delay, but I had a flood in the store and this has been very difficult. I only replaced it today, and It turned out, it was the UB300 damaged.
It's working again.
Thanks!
 
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